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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Changes in cumulative translation adjustment, tax $ (0.4) $ 0.1 $ (1.3) $ (0.7)
Changes in unrealized gains on derivative instrument, tax 0.0 0.0 0.0 0.0
Amortization of prior service credit, tax 0.0 0.0 0.1 0.1
Amortization of actuarial net losses, tax $ (0.1) $ (0.1) $ (0.6) $ (0.4)